No no no! That's wrong! You almost never touch the main boiler. That's like using the main engines on a ship for delicate docking manoeuvres. You use the boiler to get it in the right general range, for the season, then fine tune with the individual radiator each day. If they'd realised this principle on the Titanic, it would've sailed past that iceberg.|
Source: I know nothing about gas because all my heaters are electric storage heaters. I just like similes. And smileys That bit about the Titanic isn't true. I don't think it even had thrusters, though I believe the Titanic II will have.
Oh for goodness sake, I've caught my scrotum in my zip again - Margaret Thatcher, 1986